What's the (Quantum) Matter with Black Holes? Dark Energy and Condensate Stars

OKC/Nordita High-Energy Physics Theory seminar

Monday 08 June 2015
from 13:15
to 14:15 at
122:026

Speaker :

Emil Mottola (Los Alamos)

Abstract :

General Relativity receives quantum corrections relevant at macroscopic distance scales
and near event horizons. These arise from the conformal scalar degree of freedom
generated by the trace anomaly. At event horizons the conformal anomaly
scalar degree of freedom can have macroscopically large effects on the geometry,
potentially removing the classical event horizon of a black hole, replacing it with
a quantum boundary layer where the effective value of the gravitational vacuum energy
density can change. In the full effective theory, the cosmological term becomes a dynamical
condensate, whose value depends upon boundary conditions near the horizon.
By taking a positive value in the interior of a fully collapsed star, the effective
cosmological term removes any singularity, replacing it with a smooth dark energy interior.
The resulting gravitational condensate star (or gravastar) configuration resolves all
black hole paradoxes, and provides a testable alternative to black holes as the final state
of complete gravitational collapse. The observed dark energy of our universe likewise may
be a macroscopic finite size effect whose value depends on the cosmological horizon scale.